Medium Wave Broadcasting Transmitter Antenna Duplexer Matching Network Design And Realization

When the world enters to the information age, broadcasting technology has made a great progress. Meanwhile, more and more radio programs to broadcast, medium-wave transmitter have become particularly important. However, the area of medium-wave transmitting station is limited, and medium wave antenna under-ground grid takes up a lot place to stand, consequently, a medium scale medium-wave stations generally only have four medium-wave transmitting antennas, and two different frequency use one antenna to transmit is a good way to solve the difficulty between increasing frequency and limited antenna. In the time when Duplex matching network does not appeared, one antenna only transmitted one medium-wave transmitter's signal, after the appearance of the duplex matching network, two different frequency signals can be transmitted by one AM transmitting antenna. Doubled the number of frequency, it greatly slowed the plight of the insufficient number of antennas.This paper mainly introduces the whole design procession of duplex matching network and how to produce some of the elements, besides introduce how to use computer to design the duplex matching network. First of all get antenna-feeder system parameters; then according to the parameter corresponding we select will add in the duplex matching network to match its demands, we choose preset network, blocking network, T type matching network and trap network. When parts of network selection completed, we start to calculate each part of the network parameters. After the results are come out, we use these data to put into use and debug it. However, because of the error by the installation or components, we should adjust it in order to working stable and good Performance. Furthermore, once in a while we should adjust the network, so as to ensure that it matches the feeder impedance.